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MODU-FIRE® FORCED DRAFT
Gas-Fired Boiler Installation
Under no circumstances should the hydronic system
be flushed while the boiler is attached to the system
since the debris or corrosion products could accu-
mulate in the boiler and plug the boiler heat ex-
changer.
If the piping system attached to this unit will be
chemically cleaned, the boiler must be disconnected
from the system and a bypass installed so that the
chemical cleaning solution does not circulate
through the boiler.
Filling
To be sure that the boiler is not air-bound, open the
pressure-relief valve located at the rear of the boiler.
Leave the relief valve open until a steady flow of
water is observed. Close the valve and finish filling
the system.
3.8.5 Water Quality
The boiler is designed to operate in a closed-loop
system using water or water/glycol only. As such,
the system should be tight and not require make-up
water. A high percentage of untreated make-up wa-
ter can cause premature failure due to build up of
scale. Such failure is not covered by warranty.
Scale can also reduce efficiency. For example, a
scale thickness of 1/16 inch will result in a 12.5%
loss of efficiency.
The water quality should be within the guidelines
established by the American Boiler Manufacturers
Association, as follows:
• Total solids: 2,500 ppm
• Total alkalinity: 500 ppm
• Total hardness: 150 ppm
In addition, the amount of oils, fats, grease, and
other organic matter should be limited to 10 ppm.
Consult your water conditioning or chemical treat-
ment supplier for analysis and recommendations.
Employing a conscientious and competently admin-
istered program with emphasis on good maintenance
practices as outlined by your water treatment spe-
cialist is recommended.
If water/glycol is to be used in the system, the cus-
tomer should perform a hazard analysis to determine
proper use and disposal.
3.9
BURNER AND IGNITION SYSTEM
3.9.1 Inspection
Inspect the burners to be sure nothing was damaged
or knocked loose during shipment. Inspect the main
gas train and ignition assembly to be sure they were
not damaged during shipment or installation.
Check all gas unions for tightness.
3.10
PRE-START CHECK LIST
Before attempting to start the boiler, make sure the
following items have been completed.
1. Flue gas from the boiler is properly vented. (See
section 3.6)
2. Gas connection has been made, pressure tested
for leakage, and the line purged of air. (See sec-
tion 3.7)
3. Water connections are complete, and the boiler
and system have been filled and purged of air.
(See section 3.8)
4. The boiler must be connected to a 230 volt / 60
Hz / 1 Ph power source with proper polarity, a
dedicated machinery ground, and provided with
a disconnect having adequate overload protec-
tion. (See section 3.4)
5. Combustion air openings are not obstructed in
any way and have adequate capacity. (See sec-
tion 3.5)
6. The boiler is located with the proper clearances
as shown in this manual. (See Section 3.3.3)
7. Relief valves have been properly piped to floor
drains. (See section 3.8.3)
8. There are no flammable liquids, materials or
hazardous fumes present in the environment.
9. Remove/account for all tools and parts.
10. All panels and parts should be properly in-
stalled.
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